From: Marcelo Ricardo Leitner <mleitner@redhat.com>
To: David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org, hannes@stressinduktion.org
Subject: Re: [PATCH stable 3.2 3.4] ipv4: disable bh while doing route gc
Date: Mon, 13 Oct 2014 13:58:31 -0300 [thread overview]
Message-ID: <543C04B7.1040005@redhat.com> (raw)
In-Reply-To: <20141013.125225.1129718741415025861.davem@davemloft.net>
On 13-10-2014 13:52, David Miller wrote:
> From: Marcelo Ricardo Leitner <mleitner@redhat.com>
> Date: Mon, 13 Oct 2014 13:20:38 -0300
>
>> Further tests revealed that after moving the garbage collector to a work
>> queue and protecting it with a spinlock may leave the system prone to
>> soft lockups if bottom half gets very busy.
>>
>> It was reproced with a set of firewall rules that REJECTed packets. If
>> the NIC bottom half handler ends up running on the same CPU that is
>> running the garbage collector on a very large cache, the garbage
>> collector will not be able to do its job due to the amount of work
>> needed for handling the REJECTs and also won't reschedule.
>>
>> The fix is to disable bottom half during the garbage collecting, as it
>> already was in the first place (most calls to it came from softirqs).
>>
>> Signed-off-by: Marcelo Ricardo Leitner <mleitner@redhat.com>
>> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
>
> Please add my:
>
> Acked-by: David S. Miller <davem@davemloft.net>
>
> and submit this directly to -stable, thanks.
Will do. Thanks.
Marcelo
next prev parent reply other threads:[~2014-10-13 16:59 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-13 16:20 [PATCH stable 3.2 3.4] ipv4: disable bh while doing route gc Marcelo Ricardo Leitner
2014-10-13 16:52 ` David Miller
2014-10-13 16:58 ` Marcelo Ricardo Leitner [this message]
2014-10-13 17:51 ` [PATCH stable v3.2 v3.4] " David Miller
2014-10-20 3:09 ` Ben Hutchings
2014-10-20 4:23 ` David Miller
2014-10-20 12:23 ` Ben Hutchings
2014-10-20 15:39 ` David Miller
2014-10-21 19:08 ` Marcelo Ricardo Leitner
2014-10-21 19:32 ` Ben Hutchings
2014-10-21 19:51 ` Marcelo Ricardo Leitner
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